ELECTRICAL PROTECTION USING A SEMICONDUCTOR SWITCH

摘要

The subject matter disclosed herein relates to methods and devices for protecting a circuit against overcurrents. The device uses variable impedance properties of a semiconductor switch and includes closed-loop control for controlling the impedance of the switch as a function of the overcurrents to be corrected. The physical design stresses of an electrical circuit, linked to the protection against overcurrents, can therefore be limited.

主权项

1. A method implemented in an aircraft, for protecting an electrical circuit of this aircraft against overcurrents, said circuit comprising a load, a power source electrically powering the load and comprising at least one electrical generator of the aircraft, and an electrical link linking the load and the power source, the method comprising measuring a current circulating on the electrical link, and comprising:
comparing the measured current (Imes) with a reference current (Iref); when the measurement current (Imes) is greater than the reference current (Iref), triggering of a closed-loop control of the impedance of a semiconductor switch mounted in series on the electrical link, so as to regulate the measured current (Imes) to the value of the reference current (Tref), the closed-loop control being applied as long as the measured current (Imes) does not fall back below the reference current (Iref); measuring a time, called regulation time, during which the closed-loop control is implemented; and opening the switch when the regulation time is greater than a predetermined time (Tref).